image overlap message for exposure 2 of trigger 1142847
uvot_overlap.pl vrs. 2010-12-20b fem started at 221201d20h11m25s366686usUT
The observation of trigger 1142847 started 2022-12-01T12:31:13.2
Examining file ./1142847_g367_uvot_sky_image.fits
The exposure ID is 691590673
The exposure time is 202.087 (seconds)
The filter is U.
The uvot region is centered at (266.9177,-68.2466) with a roll angle of 335.6
It is square with sides of 2.68 arc min. for an area of 7.17 sq arc min
The BAT error circle is centered at (266.9330,-68.2600) with a radius of 3.000 arc min
This is 0.873 arc min from the center of the uvot region
The area of the BAT error circle is 28.27 sq. arc min
The UVOT/BAT overlap is 7.17 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (266.9246,-68.2488) with a radius of 0.035 arc min
This is 0.204 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1142847
find_uvot_ag.pl vrs. 2020-10-30 fem started at 221201d20h11m37s498352usUT
Observation start time is 2022-12-01T12:31:13.2
Examining file ./1142847_g367_uvot_catalog_image.fits
The exposure ID is 691590673
The exposure is 202.087 sec.
The bin size is 2 pixels
The filter is U
There are 14 detected source(s) for 1142847_g367
Aspect correction adds 0.00140 degrees (0.336 sec of time = 1.87 arc sec) to RA
Aspect correction adds 0.00079 degrees ( 2.85 arcsec) to Dec
Total aspect correction is 3.40 arcsec
Star catalogs centered at 266.9288 , -68.2485 with radius 2.59 arc min.
n_usno: 246 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 12 matched entries is 0.410" for 1142847_g367
Mean and std. dev of mag. difference (MAG_DELTA) are 0.752 and 0.769 for 1142847_g367
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1142847_g367.
Acceptable entries have no ID, XRT distances < 5.25", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
Magnitude criteria will be applied later.
BAT distances are from RA=266.9330 (17:47:43.92) DEC=-68.2600 (-68:15:36.0)
XRT distances are from RA=266.9246 (17:47:41.91) DEC=-68.2488 (-68:14:55.8)
-----------------
Entry 9 in the list of sources is a candidate afterglow for 1142847_g367 with genie
ra=266.96135 (17:47:50.72) dec=-68.26955 (-68:16:10.4) +/- 0.7" mag=18.34+/-0.18
dist=89.2 REFID=1 major=0.7 minor=0.3 flag=16 (aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 51.1 arc sec from the BAT position.
This source is near the edge of image (0.970)
Found 6 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 arc sec of a source list entry are considered a match)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
266.9606 -68.2702 2.4 -1 USNO-B1 16.05 14.88 15.40 *
266.9635 -68.2702 3.8 -1 USNO-B1 19.26 16.84 17.91 *
266.9645 -68.2701 4.8 -1 USNO-B1 19.50 18.04 18.69 *
266.9534 -68.2732 16.9 -1 USNO-B1 19.50 18.37 18.87
266.9713 -68.2705 13.8 -1 USNO-B1 16.81 15.43 16.04
266.9635 -68.2741 16.8 -1 USNO-B1 19.61 18.44 18.96
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
-----------------
Entry 12 in the list of sources is a candidate afterglow for 1142847_g367 with genie
ra=266.97158 (17:47:53.18) dec=-68.26984 (-68:16:11.4) +/- 0.7" mag=18.49+/-0.19
dist=98.2 REFID=2 major=0.8 minor=0.5 flag=16 (aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 62.5 arc sec from the BAT position.
This source is near the edge of image (0.971)
Found 5 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
266.9606 -68.2702 14.6 -1 USNO-B1 16.05 14.88 15.40
266.9635 -68.2702 10.8 -1 USNO-B1 19.26 16.84 17.91
266.9645 -68.2701 9.4 -1 USNO-B1 19.50 18.04 18.69
266.9713 -68.2705 2.4 -1 USNO-B1 16.81 15.43 16.04 *
266.9635 -68.2741 18.8 -1 USNO-B1 19.61 18.44 18.96
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 46277.172 counts in the bkg source region of 5798.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.982 counts/pixel (5-sig UL in 4" is 19.11 mag) for 1142847_g367
There are 1533.6685 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 7.746 counts/pixel for 1142847_g367
There are 8648.5635 counts in the xrt_bkg source region of 1074.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 8.053 counts/pixel (5-sig UL in 4" is 19.10 mag) for 1142847_g367
There are no candidates inside BAT error circle, but outside XRT error circle.
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.66, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1142847_691590673_221201d20h11m37s498352usUT_bkg.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(266.9177,-68.2466,45")
fk5;-circle(266.916164316802,-68.2523048055058,6")
fk5;-circle(266.91725216535,-68.2470486661976,6")
fk5;-circle(266.917800387207,-68.2559562605753,6")
fk5;-circle(266.909315648953,-68.2528774812797,6")
fk5;-circle(266.92496875029,-68.2595298476244,6")
fk5;-circle(266.941234238505,-68.2373930817364,6")
Region file: 1142847_691590673_221201d20h11m37s498352usUT_xrt.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(266.92462,-68.24883,8")
Region file: 1142847_691590673_221201d20h11m37s498352usUT_xrt_bkg.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(266.92462,-68.24883,25")
fk5;-circle(266.92462,-68.24883,15")
fk5;-circle(266.916164316802,-68.2523048055058,6")
fk5;-circle(266.91725216535,-68.2470486661976,6")
fk5;-circle(266.917800387207,-68.2559562605753,6")
fk5;-circle(266.909315648953,-68.2528774812797,6")
image paragraph message for exposure 2 of trigger 1142847
------ Start for Possible Stand-alone Circular ----
In response to GRB221201 (Swift/BAT trigger 1142847) at 12:25:05 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 202 seconds with the U filter starting
337 seconds after the BAT trigger. No credible afterglow candidate has been
found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the
XRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. Data
from the list of sources generated on-board are not available at this time. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.066.
------- notes for trigger 1142847 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 221201d20h11m41s738036usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1142847
-expid=691590673 -meonly -msg_image
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/1142847/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 691590673.22422 or about 2022:335:12:31:08 UT
No information found about the number of stars in the star catalog for srclist
region.
Found 14 source(s) in Genie image catalog. Found 2 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 19.66 mag. Found 242 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
25% of the Genie image region.
Genie image analysis:
Found 46277.2 counts in the large background region of 5798.0 pixels or a rate
of 7.982 counts/pixel in a radius of 45.0 arcsec. Based on this background, the
typical 5-sigma UL at a random point in the Genie image is 18.93 mag. for a
4-arcsec aperture.
Found 1533.7 counts in the XRT position region of 198.0 pixels or a rate of
7.746 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.301 +/- 0.212 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.635 cps or 18.66 mag. The closest Genie
source has ra= 266.9173 dec= -68.2471 mag=17.92 sep=11.74".
All AG candidates sorted by magnitude for the current finding chart.
(U/V/White SRCLIST mags < 17.5/17.5/18.5 are reliable. Mag > 18.5/18.5/19.5 are
not. Others are uncertain.)
(U/V/White Genie image mags < 18.0/18.0/19.0 are reliable. Mag > 19.0/19.0/20.0
are not. Others are uncertain.)
(Magnitudes followed by * have been corrected for exposure.)
---MET--- -dt- filter ---RA-- ---DEC--- -MAG/Limit Dist(") Source Asp.Corr?
691590673 337 ? srclist data are not available.
691590673 337 U image found no candidates.
List afterglow candidates for other finding charts.
691590515 179 WHITE srclist found no candidates.
691590515 179 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -68.24883
GRB_ERROR: 5.25
GRB_RA: 266.92462
IMAGE_START_TIME: 12:31:08
MAGNITUDE: 18.7
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT